LOW ACID ORGANOMETALLIC CATALYST FOR THE PRODUCTION OF FLEXIBLE, SEMI-FLEXIBLE AND RIGID POLYURETHANE FOAMS.

摘要

The present invention relates to an improvement in flexible, semi-flexible and rigid foams formed by the catalytic reaction of an aromatic polyisocyanate, a polyol and a blowing agent and a process for preparing such polyisocyanate. The improvement resides in using an effective amount of a bismuth carboxylate or bismuth sulfonate having less than 34% free acid as the catalyst.